Rot you should add an optional time limit so we get a chance to win.
Make a brick that lets you win. The new version is supposed to be objective based, try using the events.
You can do time limits and kill x number of zombies with events, and they really don't take that long to make either.
and just take out tank zombies. it is freaking impossible to beat em by yourself. Like trying to kill a huge zombie bot thing that destroys everything in a few hits.
If the tank is too powerful, don't make a spawn for them, silly.